By the movements of the earth's crust are also large quantities of layers of soil moved or shifted. The one part becomes higher than the other part. For example, the rock salt which is situated at a great depth. Due to pressure from the moving plates changes the salt layer in a liquid mass, and the fractures will be pressed in. This happened among other Hengelo, leaving underground salt domes arose. The salt alone was not enough to use up. In 1886 they met by chance in these salt deposits. And in 1919 began the production of salt in Boekelo. Today there are many places in Twente to see the distinctive green colored salt cottages in the countryside. Built in Saxon style with even a facade sign. In the salt cabins kilometers long pipes into the ground. Because of the tubes is discharged hot water in the salt layer deep in the ground. The solid salt turns into a liquid mass in salt brine. In other tubes, the brine water is then pumped up and transported to the salt factories, where it is further processed.
Assigns Grounds are another feature in the landscape by tectonic influences. Groundwater generally flows from higher ground to an area somewhat lower. Along the Peelrand in Limburg flow is hampered by difficult to not water permeable layers. Layers of clay or iron oerbanken hinder the groundwater flow. Against all logic in the water will find its way to the top and comes as seepage at the surface. This particular type of seepage is called pointing. The higher grounds are so wet and swampy area and the lower-lying areas remain covered drier than expected. Assigns Water contains a lot of iron and gives the water a beautiful rust red color. The iron is oxidized when it comes into contact with oxygen and then turns reddish brown. Many streams in the region of the Peelhorst color then red-brownish. Points is a very rare phenomenon and a point between Uden and Vorstenbosch in 2004 also by the province of North Brabant declared a geological monument.
Under the influence of tectonic forces in eastern Netherlands parts of the earth's crust along fault lines shifted vertically. The younger layers are worn away due to erosion so that the deep layers came to the surface. The ground around Winterswijk has a wide variety of layers from different periods. Layers as:
- fur sand sandstone
- rock salt
- and Carboniferous
- Triassic limestone.
The place where to find the most outstanding relics, is the quarry of Winterswijk. A few kilometers east of Winterswijk, towards the German border. Here are some limestone quarries which has been preserved by peaceful sedimentation the past. In the different layers are found among different footprints and tracks of dinosaurs. There are also several discoveries made from minerals such as marcasite, galena, pyrite and calcite. In 1932 the limestone quarry of Winterswijk was put into operation in the year 2014 and one limestone quarry is still won which is mainly used in road construction and in the fertilizer industry. The other two slots are protected area. In 2005 the area was declared by the Dutch government to Winterswijk National Landscape. For years an eagle owl nesting pair in the quarry and take the rare natterjack true.
The quarry is not freely accessible but there are annual open days to myself to look for fossils of Winter Wijks gold.